Trapa natans is a widespread Euro-Siberian water plant, growing at a depth of 1–3 m in lakes and often covering the surface with its distinctive rosettes of rhombic leaves. The flowers are inconspicuous and more or less submerged in the axils of floating leaves. The fruit is a large, sharply horned nut, often found on lake margins. In Greece Trapa natans occurs in some of the main lakes in the north (Kastoria, Kerkini, Prespa, etc.).
Greece (North Central Greece ‒ present; North-East Greece ‒ present)
Native / Non Range-Restricted
Presidential Decree 67/81